Charging and Discharging Current Characteristics of Polypropylene Film under Varied Electric Fields

Zhaoliang Xing, Fuqiang Tian, Shaowei Guo, Shuting Zhang, Fei Li, Jieyi Liang, Huize Cui and Xiying Dai
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Zhaoliang Xing: State Key Laboratory of Advanced Power Transmission Technology, Beijing 102209, China
Fuqiang Tian: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Shaowei Guo: State Key Laboratory of Advanced Power Transmission Technology, Beijing 102209, China
Shuting Zhang: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Fei Li: State Key Laboratory of Advanced Power Transmission Technology, Beijing 102209, China
Jieyi Liang: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Huize Cui: State Key Laboratory of Advanced Power Transmission Technology, Beijing 102209, China
Xiying Dai: State Key Laboratory of Advanced Power Transmission Technology, Beijing 102209, China

Energies, 2022, vol. 15, issue 14, 1-9

Abstract: Charging and discharging current behavior under high DC electric field in polypropylene (PP) film is closely related to the charge transport and accumulation process, which has an important effect on the electrical insulating properties of PP. In this paper, the dependence of the charging and discharging current of polypropylene films on time and electric field has been comprehensively studied. The results showed that the transient and steady current values of the charging and discharging process increase with the increase of electric field. Dependence of the charging current on the electric field conformed well to the space charge limited current (SCLC) theory with a transition electric field of 270 kV/mm, at which the charge transport changed from ohmic conduction to SCLC conduction. The carrier mobility derived from the discharging current became significantly smaller with increase of the charging electric field. The charge accumulation after discharging was derived from the integration of the difference of the charging and discharging current and it showed an increase with the electric field and increased sharply above a certain threshold electric field (the same as the transition electric field in SCLC theory). It was proved that the conduction current and charge accumulation evolution and dependence on the electric field were mainly determined by the balance between the electrode charge injection process and the bulk conduction process.

Keywords: charge transport; DC breakdown; conduction current; polypropylene film (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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